The Spanish flu was an influenza pandemic spread January 1918 to December 1920 infected 500 million people around the world, about a quarter of the world's population at that time.

1. Emergency hospital during influenza epidemic, Camp Funston, Kansas

Emergency hospital during the Spanish flu in 1918, National Museum of Health and Medicine.
Beds with patients in an emergency hospital in Camp Funston, Kansas, in the midst of the influenza epidemic (Spanish flu). The flu struck while America was at war, and was transported across the Atlantic on troop ships.
Photo Date: 1918